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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
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/*- * Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: release/9.1.0/sys/boot/i386/libi386/amd64_tramp.S 129240 2004-05-14 20:29:30Z ru $ */ /* * Quick and dirty trampoline to get into 64 bit (long) mode and running * with paging enabled so that we enter the kernel at its linked address. */ #define MSR_EFER 0xc0000080 #define EFER_LME 0x00000100 #define CR4_PAE 0x00000020 #define CR4_PSE 0x00000010 #define CR0_PG 0x80000000 /* GRRR. Deal with BTX that links us for a non-zero location */ #define VPBASE 0xa000 #define VTOP(x) ((x) + VPBASE) .data .p2align 12,0x40 .globl PT4 PT4: .space 0x1000 .globl PT3 PT3: .space 0x1000 .globl PT2 PT2: .space 0x1000 gdtdesc: .word gdtend - gdt .long VTOP(gdt) # low .long 0 # high gdt: .long 0 # null descriptor .long 0 .long 0x00000000 # %cs .long 0x00209800 .long 0x00000000 # %ds .long 0x00008000 gdtend: .text .code32 .globl amd64_tramp amd64_tramp: /* Be sure that interrupts are disabled */ cli /* Turn on EFER.LME */ movl $MSR_EFER, %ecx rdmsr orl $EFER_LME, %eax wrmsr /* Turn on PAE */ movl %cr4, %eax orl $(CR4_PAE | CR4_PSE), %eax movl %eax, %cr4 /* Set %cr3 for PT4 */ movl $VTOP(PT4), %eax movl %eax, %cr3 /* Turn on paging (implicitly sets EFER.LMA) */ movl %cr0, %eax orl $CR0_PG, %eax movl %eax, %cr0 /* Now we're in compatability mode. set %cs for long mode */ movl $VTOP(gdtdesc), %eax movl VTOP(entry_hi), %esi movl VTOP(entry_lo), %edi lgdt (%eax) ljmp $0x8, $VTOP(longmode) .code64 longmode: /* We're still running V=P, jump to entry point */ movl %esi, %eax salq $32, %rax orq %rdi, %rax pushq %rax ret